[Bug 80901] New: [radeon] loading corrupts lspci entry + unloading crashes kernel

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=80901

            Bug ID: 80901
           Summary: [radeon] loading corrupts lspci entry + unloading
                    crashes kernel
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16.0
          Hardware: IA-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: amerryfellow@gmail.com
        Regression: No

Created attachment 143901
  --> https://bugzilla.kernel.org/attachment.cgi?id=143901&action=edit
lspci w/ radeon

Hi all. I've been searching the internet for quite a while now, but couldn't
find any solution to my problem. I currently am on a laptop Dell Inspiron 15R
SE, with a i7 3632QM cpu ( which embeds a i915 intel card ) and a discrete
AMD/ATI Radeon HD 773M.

I know this kind of hybrid graphics setup's support is getting better more
recently, but I still am facing some problems with the open source driver.

The main problem is that, I don't really know if ( with PRIME ) my card is
working at all. This is because when I tried the tool radeontop, it couldn't
find my card. This is due, I suspect, to the fact that whenever I load my
"radeon" module, I think it messes up the device. This seems confirmed by the
fact that I get a clean lspci -vvv when the module is unloaded, and a "unknown
header type 7f" when the module is loaded. See attachments please.

Also, it takes a few seconds to load the module itself, and when I unload it (
modprobe -r radeon ) it crashes my machine, right after a few seconds. The
system log shows a dereference problem, but "live" I can only see the stack
trace the kernel outputs and nothing more.


Steps to Reproduce:
modprobe radeon
modprobe -r radeon

Actual Results:
Radeon's LSPCI entry is messed up and card is not recognized by tools. On
unloading, crashes.

Expected Results:
Radeon's LSPCI entry is ok, radeon card is recognized and on unloading,
nothing.

Build Date & Hardware:
Laptop Dell Inspiron 15R SE
Intel i7 3632QM
AMD Radeon HD 7730M Cape Verde

Software:
Arch Linux
Custom Kernel 3.16.0-rc6
Xorg-server 1.16.0-2
xf86-video-intel 2.99.912-4
xf86-video-ati 1:7.4.0-3

Additional Builds and Platforms:
Problem encountered also with stock kernel config and with kernel version 3.13.

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